Which of the following is NOT part of the HIPPO acronym?

The HIPPO acronym refers to a framework used to describe the primary threats to biodiversity and ecosystems. It stands for Habitat loss, Invasive species, Pollution, and overpopulation (often interpreted as "People"). Each of the components of HIPPO highlights a significant human impact on the environment.

In this context, pollination, although crucial for many ecosystems and directly tied to biodiversity, is not a threat factor within the HIPPO acronym. Instead, pollination is a natural ecological service that facilitates the reproduction of many plants, thereby supporting wider ecosystems. The other options—habitat loss, invasive species, and pollution—are recognized as direct threats that result in the decline of biodiversity, making them integral components of the HIPPO framework. Hence, understanding these elements emphasizes the need to address human impacts on the environment to conserve biodiversity effectively.